- #1
ngorecki
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Homework Statement
Objects with masses m1 = 12.0 kg and m2 = 4.00 kg are connected by a light string that passes over a frictionless pulley. If, when the system starts from rest, m2 falls 1.00 m in 1.70 s, determine the coefficient of kinetic friction between m1 and the table.
Homework Equations
Fg = Fn = mg
F = ma
μ = Ff/Fn
The Attempt at a Solution
Fg = mg
Fg = 16*9.8
Fg = 156.8 = Fn
F = ma [m2]
= 4*9.8
= 39.2
ƩFx = m2 - Ff (sum of all forces in the x direction is = m2 - Frictional force)
= 39.2 - Ff
Ff = 39.2
μ = Ff/Fn
μ = 39.2/156.8
μ = .25
I tried entering the coefficient of kinetic friction into the "submit box" but the answer is incorrect.
could somebody please point out my mistake?